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If his MacBook won't turn on and he's tried everything, the only way to wipe the HDD is to remove it and place it in an external case or use an adapter. He can then attach the external case with the drive or the adapter with the drive to another Mac or a PC and secure wipe the drive.

You didn't mention what model Mac he has. Get the model number and search the Apple knowledge base for instructions on how to remove the drive. I'm assuming he wants to secure wipe the drive and put it back in the machine so he can sell it on eBay.